BS 7973 Spacers and chairs for steel reinforcement and their specification
Author: Technical Committee B/525 | Size: 0.44 MB | Format: PDF | Publisher: BSI | Year: 2001 | pages: 18 | ISBN: 0580385566
This part of this British Standard specifies product performance requirements for spacers and chairs
sufficient to achieve and maintain cover to reinforcement in in situ reinforced concrete members subject to
normal construction loads when used in accordance with BS 7973-2.
NOTE Where appropriate, the basic principles can be applied to precast concrete or proprietary systems.
Product requirements for spacers and chairs include their dimensions, identification, point load strength,
permanent deflection after loading, stability and fixity.
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Author: Technical Committee B/525 | Size: 0.44 MB | Format: PDF | Publisher: BSI | Year: 2001 | pages: 22 | ISBN: 0580385574
This part of this British Standard specifies fixing and application requirements for spacers and chairs
sufficient to achieve and maintain cover to reinforcement in in situ reinforced concrete members subject to
normal construction loads. Application requirements include tying and spacing.
This British Standard applies to all types of reinforcement conforming to BS 4449 and BS 4482 and some
types of welded fabric conforming to BS 4483, supplied to the preferred shapes and tolerances given in
BS 8666.
Other important aspects such as clear and unambiguous detailing, the need to consider buildability,
formwork tolerances and reinforcement are not specified. Standards of workmanship and supervision are
also outside the scope of this British Standard as is a means of resisting wind loads or enabling the lifting
of prefabricated reinforcement cages.
NOTE 1 Where appropriate, the basic principles can be applied to precast concrete or proprietary systems.
NOTE 2 Straight reinforcement for curvilinear members to be formed to a radius exceeding the maximum radius of bending given in
BS 8666 may require extra tying and support to resist additional loads caused by the springing effect of the bars.
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